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(TH2/3) High and Low Frequency Alfvén Modes in Tokamaks

   
S. Briguglio , L. Chen ¹, J. Q. Dong ², G. Fogaccia , R. A. Santoro ³, G. Vlad , F. Zonca 
 
Associazione EURATOM-ENEA sulla Fusione, C.P. 65, 00044 Frascati, Rome, Italy
¹ Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, U.S.A.
² Southwestern Institute of Physics, Chengdu, China
³ Naval Research Laboratory, Washington, D.C. 20375, U.S.A.

Abstract
We present an analysis of the typical features of shear Alfvén waves in tokamak plasmas in a frequency domain ranging from the ``high'' frequencies ( $\omega \cong v_A/2qR_0$; $v_A$ being the Alfvén speed and $qR_0$ the tokamak connection length) of the toroidal gap to the ``low'' frequencies, comparable with the thermal ion diamagnetic frequency , $\omega_{*pi}$ and/or the thermal ion transit frequency $\omega_{ti} = v_{ti}/qR_0$ ($v_{ti}$ being the ion thermal speed).

 

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